# name = input("please enter your name:")
# # 见名知义，
# name1 = input("please enter your name:")
# student_age = input("please enter your name:")
# studentNumber =11
# print()

# 26字母  _  数字 数字不能在变量名字的首部


# s = input("请输入表达式:")       # 输入100 + 200 * 300
# v = eval(s)                     # 等同于 v = 100 + 200 * 300
# print("您输入的表达式经过eval执行后结果为", v)

# x = 100
# y = 200
# s = '''z=x+y
# print('z=', z)
# print("hello world!")
# '''
# exec(s)  # 执行 s这个字符串
# print(s)

import time
def show_time():
    while True:
        t =time.localtime()
        print("\r %2d:%2d:%02d" %(t[3],t[4],t[5]),end="")    # \r 回到行首，进行刷新时间
        time.sleep(1)
show_time()





